Malicious PDF — malware analysis report

Static analysis result for SHA-256 66db06b900398374…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 12:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ffc74236144fd9dc95b4a971eec8702 SHA-1: becd6ff8a0fddfd939de015b4cd286893dfbdc35 SHA-256: 66db06b900398374cdb8d5f585514617cf11405125bdae446f8e2089b8237c9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript serving as the execution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jphotographyllc.com/userfiles/file/jekopegexuxiwatogufuxudi.pdf In PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10748778265.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/wurudoxulo.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/sipadazatavujenerosol.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/lomuzurobikosa.pdfIn PDF document text
    • https://simorgh.it/uploads/file/88085385330.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/47684155011.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76444126105.pdfIn PDF document text
    • http://sissonne.hu/editor_up/77406383944.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wupoxilu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416521452ad---pezamaxiwat.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/14128552927.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/77348321474.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/84381366880.pdfIn PDF document text
    • https://sharenkon.com/files/zeduduwaxudidasu.pdfIn PDF document text
    • https://cet.sk/res/file/4539886000.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/90957311425.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/58531985036.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vapagoxi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6ee0eb233ca696f9fa7967a0772adc94/fetuzaxenumuw.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5dc35aef4---gaxibimasixoduvosep.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/pasekewutifinuzawinoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+android+debug+bridge+windowsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 17576 bytes
SHA-256: aafa5836e5ba206f04556a614053de97e85ea2b506a6bd572fdfc4c1a337acff
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10652 bytes
SHA-256: 57822a0e19860b1a4a5478a4267652625c9b2130eaf1d46aea1e81af4028b063
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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